The Track Roller — also known as Bottom Roller or Lower Roller — is one of the most critical undercarriage components installed beneath the track frame of Komatsu PC650 crawler excavators.
For a 65-ton class excavator, each track roller operates under extremely high static and dynamic loads. It supports the machine weight, guides the track chain and transfers ground pressure evenly during excavation and mining operations.
PC650 machines are commonly used in:
The track roller works under severe conditions including:
A worn or damaged roller may lead to:
Our Komatsu PC650 track rollers are manufactured according to OEM-style drawings and heavy-duty production standards, providing reliable aftermarket replacement solutions for large excavators.
Designed specifically for:
Suitable for demanding mining and heavy construction environments.
Available:
to match different positions on the track frame.
Manufactured from:
40Mn2 / 50Mn alloy steel
Advantages:
The roller tread surface is induction hardened:
This improves resistance against:
Equipped with:
Designed to prevent:
Manufactured with:
Provides direct bolt-on replacement without modification.
| Item | Specification / Detail |
|---|---|
| Machine Model | Komatsu PC650 Excavator |
| Compatible Models | PC650 / PC650LC / PC650-6 / PC650-7 / PC650-8 |
| Machine Class | 65 Ton Excavator |
| Part Type | Track Roller (Bottom Roller / Lower Roller) |
| OEM Part Number | 21M-30-00100 / 21M-30-0010A / 4473719 / 9109493 |
| Flange Type | Single Flange (SF) / Double Flange (DF) |
| Material | High-strength 40Mn2 / 50Mn Alloy Steel |
| Manufacturing Method | Forging / Casting / Machining |
| Surface Hardness | HRC 52-58 |
| Hardening Depth | 5mm - 10mm |
| Sealing | Heavy-duty floating oil seal, lifetime lubricated |
| Mounting | OEM standard, bolt-on direct replacement |
| Application | Mining, quarrying and heavy construction operations |
| Shipping Note | Heavy component — sea freight recommended |
For a large excavator like Komatsu PC650, undercarriage components represent a significant investment and directly influence machine availability.
A high-quality track roller helps:
Every roller produced by our factory undergoes strict inspection:
With professional manufacturing capability for heavy excavator undercarriage parts, we provide OEM-compatible replacement solutions with stable quality, competitive pricing and warranty support.
Contact us with your machine model, serial number, OEM part number and roller position to confirm the correct replacement.
The Track Roller — also known as Bottom Roller or Lower Roller — is one of the most critical undercarriage components installed beneath the track frame of Komatsu PC650 crawler excavators.
For a 65-ton class excavator, each track roller operates under extremely high static and dynamic loads. It supports the machine weight, guides the track chain and transfers ground pressure evenly during excavation and mining operations.
PC650 machines are commonly used in:
The track roller works under severe conditions including:
A worn or damaged roller may lead to:
Our Komatsu PC650 track rollers are manufactured according to OEM-style drawings and heavy-duty production standards, providing reliable aftermarket replacement solutions for large excavators.
Designed specifically for:
Suitable for demanding mining and heavy construction environments.
Available:
to match different positions on the track frame.
Manufactured from:
40Mn2 / 50Mn alloy steel
Advantages:
The roller tread surface is induction hardened:
This improves resistance against:
Equipped with:
Designed to prevent:
Manufactured with:
Provides direct bolt-on replacement without modification.
| Item | Specification / Detail |
|---|---|
| Machine Model | Komatsu PC650 Excavator |
| Compatible Models | PC650 / PC650LC / PC650-6 / PC650-7 / PC650-8 |
| Machine Class | 65 Ton Excavator |
| Part Type | Track Roller (Bottom Roller / Lower Roller) |
| OEM Part Number | 21M-30-00100 / 21M-30-0010A / 4473719 / 9109493 |
| Flange Type | Single Flange (SF) / Double Flange (DF) |
| Material | High-strength 40Mn2 / 50Mn Alloy Steel |
| Manufacturing Method | Forging / Casting / Machining |
| Surface Hardness | HRC 52-58 |
| Hardening Depth | 5mm - 10mm |
| Sealing | Heavy-duty floating oil seal, lifetime lubricated |
| Mounting | OEM standard, bolt-on direct replacement |
| Application | Mining, quarrying and heavy construction operations |
| Shipping Note | Heavy component — sea freight recommended |
For a large excavator like Komatsu PC650, undercarriage components represent a significant investment and directly influence machine availability.
A high-quality track roller helps:
Every roller produced by our factory undergoes strict inspection:
With professional manufacturing capability for heavy excavator undercarriage parts, we provide OEM-compatible replacement solutions with stable quality, competitive pricing and warranty support.
Contact us with your machine model, serial number, OEM part number and roller position to confirm the correct replacement.
